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Priority to JP1989054052UpriorityCriticalpatent/JPH02145944U/ja
Priority to KR2019900003123Uprioritypatent/KR960003486Y1/ko
Priority to US07/521,973prioritypatent/US5026221A/en
Priority to EP90108911Aprioritypatent/EP0397193B1/en
Priority to DE69025978Tprioritypatent/DE69025978T2/de
Publication of JPH02145944UpublicationCriticalpatent/JPH02145944U/ja